CN112921838A - Method for dismantling suspension line non-hinge rib arch bridge - Google Patents
Method for dismantling suspension line non-hinge rib arch bridge Download PDFInfo
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- CN112921838A CN112921838A CN202110089533.1A CN202110089533A CN112921838A CN 112921838 A CN112921838 A CN 112921838A CN 202110089533 A CN202110089533 A CN 202110089533A CN 112921838 A CN112921838 A CN 112921838A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
Abstract
The invention relates to a method for dismantling a catenary arch bridge without hinge ribs. The method for dismantling the catenary arch bridge without the hinge ribs comprises the following steps: 1) erecting a side span support; 2) precutting the beam body; 3) jacking the pack system in place; 4) cutting the suspender and removing the arch ring; 5) removing the beam body; 6) and breaking and chiseling. The dismounting method can realize the safe, quick and convenient dismounting of the catenary arch bridge without the hinge rib.
Description
Technical Field
The invention relates to a bridge dismantling method, in particular to a dismantling method of a suspension line hingeless rib arch bridge.
Background
With the development of social economy, the service level of part of the expressway is obviously lagged behind the current economic development, in order to improve the traffic capacity and better serve the economic development of the surrounding areas, the part of the expressway needs to be rebuilt, and in the process of rebuilding and expanding construction of the expressway, the condition that the overpass needs to be dismantled and rebuilt to meet the requirement of rebuilding and expanding is often met.
However, a safe, quick and convenient method for dismantling the catenary arch bridge without the hinge rib does not exist at present.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a method of demolition of a catenary hingeless rib arch bridge that overcomes, or at least partially solves, the above-mentioned problems.
The method for dismantling the catenary arch bridge without the hinge ribs comprises the following steps:
1) and erecting a side span support
A temporary steel pipe support is erected below the arch ring beam, the temporary steel pipe support is fixed on the expansion foundation through planting bolts, and wedge-shaped square timbers are wedged and tightly packed at the top end of the temporary steel pipe support;
2) beam body precutting
Two sides of the non-span road section need to be dismantled into a beam section in advance, the removed beam section is divided into three sections in the transverse bridge direction, and cutting lines are marked on the bridge deck; drilling hoisting holes in the boundary beam and the middle beam of the removed beam section, and arranging rubber strips around the hoisting holes to protect the steel wire rope; uniformly hoisting four corners of the beam section by using steel wire ropes, tightening the steel wire ropes to enable the steel wire ropes to be uniformly stressed, and then pre-lifting according to 100% of the weight of the beam section; arranging a chain type cutting machine on each section for cutting, wherein the cut sections are inverted splayed on the vertical surfaces, firstly performing longitudinal bridge pre-cutting, and then performing transverse bridge cutting; cutting the beam section, hoisting the beam section to a bridge head, hoisting and dismantling the side beam, hoisting and dismantling the middle beam, and crushing and chiseling the middle beam by using an excavator;
3) jacking in position of pack system
The carrying system runs to the bottom of the bridge along the transfer path and is accurately positioned; gradually adjusting the height of the hydraulic module vehicle to enable the carrying support to be close to the bottom surface of the beam body, and after the carrying support is completely contacted with the bottom surface of the beam body, jacking the beam body in a grading manner according to the weight of the beam body until the suspender is loosened;
the pack transport system comprises a hydraulic module vehicle and a pack transport bracket;
4) boom cutting and arch ring cutting demolition
After the suspender is loosened, quickly cutting the suspender; cutting and dismantling the arch ring after all the suspenders are cut; the arch ring cutting and dismantling method comprises the following steps:
a. measuring and scribing; cutting and hoisting a single arch ring into 3 blocks, and after measuring and paying off, using a marking pen as an effective mark;
b. fixing the cutting equipment; the cutting equipment is fixed on the bridge floor and then adjusts the guide wheel, so that the beam body is cut according to the designed cutting line;
c. cutting and hoisting the middle segment arch ring; after the middle section arch ring is cut off, the middle section arch ring is placed to a set height and then temporarily stored, and after the two side arch ring sections are hoisted and removed, the middle section arch ring is hoisted to a specified position;
d. cutting and hoisting two side arch ring sections; the arch ring cutting equipment at the two side sections is fixed at the side of the bridge abutment, and the cutting section is not higher than the bottom of the bridge deck tying beam by 20 cm;
the vertical surface of the section cut by the arch ring is in a right-splayed shape;
5) beam removal
The pack carrying system synchronously jacks the beam body to a set height, and then the pack carrying system runs to a temporary beam storage field according to a transfer path to complete beam falling;
6) and breaking and chiseling
After an effective construction enclosure is built, hoisting and removing the rest arch legs and the rest arch ring cross beams, and then crushing and chiseling the abutment, the rest arch legs and the rest arch ring cross beams on site; and crushing and chiseling the beam body in situ; and after the crushing and chiseling are finished, the construction enclosure is dismantled.
Optionally, the boom cutting is divided into four groups for synchronous cutting, the boom is shaken before cutting to confirm that the boom is loosened, and the boom cutting sequence is that the boom is removed from the midspan to the two ends.
Optionally, the step of driving the pack transport system to the temporary beam storage yard according to the transfer path to complete beam falling comprises the following steps:
a. the carrying system moves the beam body to a beam falling support of the temporary beam storage site according to the moving path;
b. marking a cross mark on a beam falling supporting point on the bottom surface of the beam body, and finely adjusting the position of the hydraulic module vehicle before the beam falling so that the cross mark on the bottom surface of the beam body is right above a beam falling bracket;
c. the height of the hydraulic module vehicle is reduced until a roof distribution beam of the beam-carrying support is close to the top surface of the steel support, gaps between the top surface of each steel support and the bottom surface of the roof distribution beam are observed, and a steel plate is padded at a corresponding position to ensure that each fulcrum falls off the beam synchronously;
d. slowly reducing the height of the hydraulic module vehicle until the hydraulic module vehicle is empty from the carrying support, and finishing system conversion;
e. after the system conversion is finished, the beam falling condition is observed, after the safety and stability of the structure are ensured, the height of the hydraulic module vehicle is reduced to the minimum, the hydraulic module vehicle is moved out, and the beam falling is finished;
the beam falling support consists of a beam carrying support and a steel support positioned below the beam carrying support.
Optionally, a fog gun machine is adopted for sprinkling water to reduce dust during the construction period of the breaking and chiseling.
Optionally, before the beam is broken and chiseled, a soil pile with an appropriate height is arranged at the bottom of the beam.
Optionally, in the process of crushing and chiseling the beam body, symmetrically arranging 2 cannon head machines on two sides of the beam body for symmetrical balanced chiseling.
The method for dismantling the suspension wire rib-free arch bridge can realize safe, quick and convenient dismantling of the suspension wire rib-free arch bridge.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic structural view of a catenary hingeless rib arch bridge according to an exemplary embodiment of the present invention.
FIG. 2 is a side span temporary support layout;
FIG. 3 is a schematic pre-cut view;
FIG. 4 is a view of a beam segment transverse section cut line layout;
FIG. 5 is a layout view of beam segment lifting holes;
FIG. 6 is a hydraulic module cart layout;
FIG. 7 is a view of the hanger bar and arch ring cutting line layout;
fig. 8 is a layout view of the beam falling bracket.
Description of reference numerals: 1. a beam body; 2. an arch ring; 3. a boom; 4. a leg is arched; 5. an abutment; 6. an arch ring beam; 7. supporting the steel pipe; 8. expanding the foundation; 9. hoisting holes; 10. a wire rope; 11. a hydraulic module vehicle; 12. carrying the support; 13. and (5) supporting steel.
Detailed Description
The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Now, taking the dismantling of a certain through-type constant-section catenary arch bridge without articulated ribs as an example, the dismantling method of the catenary arch bridge without articulated ribs of the invention is explained in detail. The clear span of the half-through constant-section catenary rib-free arch bridge is 43m, the net-rise span ratio is 1/4.5, the height of each arch rib is 1.3m, the width of each arch rib is 0.8m, the arch axis coefficient is 1.756, the bridge span is orthogonal to the highway, and the beam bottom clearance is 6.66 m. The dismounting method of the half-through constant-section catenary hingeless rib arch bridge comprises the following steps:
1) and erecting a side span support
The temporary steel pipe support is erected below the arch ring beam, the temporary steel pipe support is fixed on the expansion foundation through planting bolts, and wedge-shaped square timber wedges are packed at the top end of the temporary steel pipe support. In one embodiment, the temporary steel pipe supports adopt phi 630 × 10mm steel pipes as stand columns, the diagonal rods and the vertical rods adopt phi 152 × 4.5mm steel pipes, the transverse rods adopt phi 203 × 6mm steel pipes, 2 rows of stand columns are arranged due to the fact that the width of an arch rib transverse beam is 8.1m, the space between the stand columns is 5m, and the side span temporary supports are arranged as shown in fig. 2.
The construction process flow of the enlarged foundation comprises the following steps: excavating a foundation pit, binding reinforcing steel bars, pouring concrete and watering for maintenance.
2) Beam body precutting
And pre-cutting the beam body along the designed cutting line, hoisting and removing partial beam sections, wherein the pre-cutting is schematically shown in figure 3. Specifically, the method comprises the following steps:
a. and measuring the scribing line. Two sides of the non-span road section are respectively dismantled with a beam section in advance, so that the beam body can be smoothly removed during moving, the length of the dismantled beam section is 3m, the beam section is divided into three sections in the transverse bridge direction, cutting lines are marked on the bridge floor, and the arrangement of the transverse sectional cutting lines of the beam section is shown in figure 4.
b. And (6) drilling a hoisting hole. The boundary beam for dismantling the beam section is provided with 2 hoisting holes, and the middle beam is provided with 4 hoisting holes, as shown in figure 5. The hoisting hole can be drilled through the core drilling machine, and rubber strips are distributed around the hoisting hole to serve as steel wire rope protection measures.
c. And (4) pre-lifting the beam section. The four corners of the beam section are uniformly hung by using the steel wire ropes, the steel wire ropes are tightened to be uniformly stressed, then the weight of the beam section is pre-lifted according to 100 percent, the hoisting distance of the truck crane needs to be checked in advance, and the hoisting capacity is ensured to meet the requirement.
d. And cutting the beam section. And arranging a chain type cutting machine on each section for cutting, wherein the cut sections are inverted splayed on the vertical surfaces, the longitudinal bridge direction is pre-cut firstly, and then the transverse bridge direction is cut. In order to prevent the chain saw chain from flying out during cutting and bring harm to people, baffles are arranged in the front and at the back of the cutting machine.
e. And (5) hoisting and dismantling. And after the beam section is cut, hoisting the beam section to a bridge head by using a truck crane, hoisting and dismantling the side beam firstly, hoisting and dismantling the middle beam secondly, and then crushing and chiseling by using an excavator.
3) Jacking in position of pack system
And removing the upper side guardrails, the central separation belts and other obstacles on the moving path. And the pack transport system runs to the bottom of the bridge along the transfer path and is accurately positioned. The height of the hydraulic module car is gradually adjusted to enable the carrying support to be close to the bottom surface of the beam body, after the carrying support is in contact with the bottom surface of the beam body, the beam body is jacked up in a grading mode according to the weight of the beam body until the suspender is loosened, and the arrangement of the hydraulic module car is shown in figure 6. The pack system comprises a hydraulic module vehicle (SPMT) and a pack support.
4) Boom cutting and arch ring cutting demolition
After the boom is loosened, the boom is quickly cut. Constructors can set up the upper bridge floor of the bamboo gangplank through bridge heads, four groups of the bamboo gangplank are synchronously cut, the hanging rods are shaken before cutting, the fact that the hanging rods are loosened is confirmed, and the cutting sequence of the hanging rods is that the bamboo gangplank is dismantled from the middle to the two ends.
And after the hanger rod is completely cut, cutting and dismantling the arch ring. The arch ring cutting and dismantling method comprises the following steps:
a. and measuring the scribing line. And 3, cutting and hoisting the single arch ring, arranging cutting lines as shown in figure 7, and using a marker pen as an effective mark after the tape measure is adopted for paying off.
b. The cutting device is fixed. The cutting equipment is fixed in the bridge floor, and the cutting equipment is fixed through beating expansion bolts. And after the cutting equipment is fixed, the guide wheel is adjusted to cut the beam body according to the designed cutting line.
c. And cutting and hoisting the middle segment arch ring. The vertical surface of the cutting section of the arch ring is in a right-splayed shape. And after the middle arch ring is cut off, the middle arch ring is placed to a lower clearance and then temporarily stored, and after the arch ring sections on the two sides are hoisted and removed, the middle arch ring is hoisted to the outer side of the high-speed highway.
d. And cutting and hoisting the arch rings of the two side sections. The arch ring cutting equipment at the two side sections is fixed at the side of the bridge platform, and the cutting section is not higher than the bottom of the bridge deck tying beam by 20 cm.
5) Beam removal
And the pack carrying system synchronously jacks the beam body to a set height, if the height is increased by 20cm, the beam body is driven to a temporary beam storage site according to the moving path to complete beam falling. And path control, speed control, oil pressure control, road self-adaptive control, beam attitude and stress control and whole-process safety control are carried out in the moving process.
The path control can be that corresponding parameter limits such as turning angles and the like are set in the hydraulic module vehicle control system in advance; positioning and navigating in real time by utilizing the established Beidou navigation system; and path marking control is carried out on the walking surface in advance, so that site constructors can conveniently and visually observe and control the path marking control.
The speed control can be realized by setting a speed limit in the hydraulic module vehicle control system in advance and controlling the translation speed within 50 m/h.
The road self-adaptive control can be used for cleaning the walking path again before moving and making protective measures to ensure the walking path to be smooth and barrier-free; when a slope or a concave-convex road surface exists, the hydraulic module vehicle can automatically adapt to the uneven road condition of a translation road, the horizontal state of the beam body is automatically adjusted, the up-down automatic adjustable range of the wheels is +/-30 cm, safety and reliability are realized, and good road surface applicability is ensured.
The beam attitude and stress control can be realized by monitoring the attitude of the beam and the stress state of a key position in real time through an established monitoring system, so that the beam attitude is ensured to be within a controllable range, and the beam stress does not exceed an allowable value.
In this embodiment, the beam falling support is composed of a beam carrying support and a steel support located below the beam carrying support, that is, the roof distribution beam of the beam carrying support is erected on the steel support to form the beam falling support, and the beam falling support is arranged as shown in fig. 8.
Specifically, the step of completing beam falling by the pack transport system when the pack transport system runs to a temporary beam storage yard according to a transfer path comprises the following steps:
a. and the pack transport system transports the beam body to a beam falling support of the temporary beam storage site according to the transport path. Before moving to the position above the beam falling support, whether the roof distribution beam is higher than the roof elevation of the beam falling support or not is judged, and 5cm of clearance is guaranteed. When necessary, the beam body is lifted and then moved to the position above the beam falling support.
b. And marking a cross mark on a beam falling supporting point on the bottom surface of the beam body, and finely adjusting the position of the hydraulic module vehicle before the beam falls to ensure that the cross mark on the bottom surface of the beam body is right above the beam falling support.
c. And (3) reducing the height of the hydraulic module vehicle until the roof distribution beam is close to the top surface of the steel support, observing the gap between the top surface of each steel support and the bottom surface of the roof distribution beam, and plugging and cushioning steel plates at corresponding positions to ensure that each fulcrum falls off the beam synchronously.
d. And slowly reducing the height of the hydraulic module vehicle until the hydraulic module vehicle is empty from the carrying support, and finishing the system conversion. In the system conversion process, the beam body and the beam falling support are monitored, the system conversion process is ensured, and the beam falling support and the beam body are stable in structure.
e. And after the system conversion is finished, observing the beam falling condition, reducing the height of the hydraulic module vehicle to the minimum after the safety and stability of the structure are ensured, moving out the hydraulic module vehicle, and finishing the beam falling.
6) And breaking and chiseling
After an effective construction enclosure is built, the remaining arch legs and the arch ring cross beams are removed by hoisting with a truck crane, and then the bridge abutment, the remaining arch legs and the arch ring cross beams are broken and chiseled on site by an excavator; and (4) utilizing an excavator to break and chisel the beam body on site.
During the construction of crushing and chiseling, a fog gun machine is needed to spray water for dust reduction, and the air dust pollution is reduced.
Before the beam body is broken and chiseled, a soil pile with the adaptive height needs to be arranged at the bottom of the beam body, so that the influence on peripheral structures when the ground is impacted after the beam body is broken is reduced.
In the process of crushing and chiseling the beam body, in order to maintain the stable structure of the beam body, 2 gun head machines are symmetrically and evenly chiseling on two sides of the beam body in a symmetrical mode, and disordered construction is strictly forbidden.
And after the crushing and chiseling are finished, the construction enclosure is dismantled.
The method for dismantling the suspension wire rib-free arch bridge can realize safe, quick and convenient dismantling of the suspension wire rib-free arch bridge.
Claims (6)
1. A method for dismantling a catenary arch bridge without hinge ribs is characterized by comprising the following steps:
1) and erecting a side span support
A temporary steel pipe support is erected below the arch ring beam, the temporary steel pipe support is fixed on the expansion foundation through planting bolts, and wedge-shaped square timbers are wedged and tightly packed at the top end of the temporary steel pipe support;
2) beam body precutting
Two sides of the non-span road section need to be dismantled into a beam section in advance, the removed beam section is divided into three sections in the transverse bridge direction, and cutting lines are marked on the bridge deck; drilling hoisting holes in the boundary beam and the middle beam of the removed beam section, and arranging rubber strips around the hoisting holes to protect the steel wire rope; uniformly hoisting four corners of the beam section by using steel wire ropes, tightening the steel wire ropes to enable the steel wire ropes to be uniformly stressed, and then pre-lifting according to 100% of the weight of the beam section; arranging a chain type cutting machine on each section for cutting, wherein the cut sections are inverted splayed on the vertical surfaces, firstly performing longitudinal bridge pre-cutting, and then performing transverse bridge cutting; cutting the beam section, hoisting the beam section to a bridge head, hoisting and dismantling the side beam, hoisting and dismantling the middle beam, and crushing and chiseling the middle beam by using an excavator;
3) jacking in position of pack system
The carrying system runs to the bottom of the bridge along the transfer path and is accurately positioned; gradually adjusting the height of the hydraulic module vehicle to enable the carrying support to be close to the bottom surface of the beam body, and after the carrying support is completely contacted with the bottom surface of the beam body, jacking the beam body in a grading manner according to the weight of the beam body until the suspender is loosened;
the pack transport system comprises a hydraulic module vehicle and a pack transport bracket;
4) boom cutting and arch ring cutting demolition
After the suspender is loosened, quickly cutting the suspender; cutting and dismantling the arch ring after all the suspenders are cut; the arch ring cutting and dismantling method comprises the following steps:
a. measuring and scribing; cutting and hoisting a single arch ring into 3 blocks, and after measuring and paying off, using a marking pen as an effective mark;
b. fixing the cutting equipment; the cutting equipment is fixed on the bridge floor and then adjusts the guide wheel, so that the beam body is cut according to the designed cutting line;
c. cutting and hoisting the middle segment arch ring; after the middle section arch ring is cut off, the middle section arch ring is placed to a set height and then temporarily stored, and after the two side arch ring sections are hoisted and removed, the middle section arch ring is hoisted to a specified position;
d. cutting and hoisting two side arch ring sections; the arch ring cutting equipment at the two side sections is fixed at the side of the bridge abutment, and the cutting section is not higher than the bottom of the bridge deck tying beam by 20 cm;
the vertical surface of the section cut by the arch ring is in a right-splayed shape;
5) beam removal
The pack carrying system synchronously jacks the beam body to a set height, and then the pack carrying system runs to a temporary beam storage field according to a transfer path to complete beam falling;
6) and breaking and chiseling
After an effective construction enclosure is built, hoisting and removing the rest arch legs and the rest arch ring cross beams, and then crushing and chiseling the abutment, the rest arch legs and the rest arch ring cross beams on site; and crushing and chiseling the beam body in situ; and after the crushing and chiseling are finished, the construction enclosure is dismantled.
2. A method of demolishing a catenary, hingeless arch bridge according to claim 1, wherein: the boom cutting is divided into four groups for synchronous cutting, the boom is shaken before cutting to confirm that the boom is loosened, and the boom cutting sequence is that the boom is dismantled from midspan to two ends.
3. The method of claim 1, wherein said piggyback system traveling along a transfer path to a temporary storage yard to complete a girder drop comprises the steps of:
a. the carrying system moves the beam body to a beam falling support of the temporary beam storage site according to the moving path;
b. marking a cross mark on a beam falling supporting point on the bottom surface of the beam body, and finely adjusting the position of the hydraulic module vehicle before the beam falling so that the cross mark on the bottom surface of the beam body is right above a beam falling bracket;
c. the height of the hydraulic module vehicle is reduced until a roof distribution beam of the beam-carrying support is close to the top surface of the steel support, gaps between the top surface of each steel support and the bottom surface of the roof distribution beam are observed, and a steel plate is padded at a corresponding position to ensure that each fulcrum falls off the beam synchronously;
d. slowly reducing the height of the hydraulic module vehicle until the hydraulic module vehicle is empty from the carrying support, and finishing system conversion;
e. after the system conversion is finished, the beam falling condition is observed, after the safety and stability of the structure are ensured, the height of the hydraulic module vehicle is reduced to the minimum, the hydraulic module vehicle is moved out, and the beam falling is finished;
the beam falling support consists of a beam carrying support and a steel support positioned below the beam carrying support.
4. A method of demolishing a catenary, hingeless arch bridge according to claim 1, wherein: and a fog gun machine is adopted to spray water to reduce dust during the construction period of crushing and chiseling.
5. A method of demolishing a catenary, hingeless arch bridge according to claim 1, wherein: before the beam body is broken and chiseled, a soil pile with the adaptive height is arranged at the bottom of the beam body.
6. A method of demolition of a catenary, hingeless rib arch bridge according to any one of claims 1 to 5, wherein: in the process of crushing and chiseling the beam body, 2 gun head machines are symmetrically and evenly chiseling the beam body on two sides symmetrically.
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| CN112921838B (en) | 2022-06-21 |
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